diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/arm/CCN.txt | 2 | ||||
| -rw-r--r-- | Documentation/filesystems/porting | 4 | ||||
| -rw-r--r-- | Documentation/sysctl/fs.txt | 7 | ||||
| -rw-r--r-- | Documentation/virtual/kvm/api.txt | 1 | ||||
| -rw-r--r-- | Documentation/x86/exception-tables.txt | 35 |
5 files changed, 46 insertions, 3 deletions
diff --git a/Documentation/arm/CCN.txt b/Documentation/arm/CCN.txt index 0632b3aad83e..715776f06df6 100644 --- a/Documentation/arm/CCN.txt +++ b/Documentation/arm/CCN.txt @@ -38,7 +38,7 @@ Example of perf tool use: / # perf list | grep ccn ccn/cycles/ [Kernel PMU event] <...> - ccn/xp_valid_flit/ [Kernel PMU event] + ccn/xp_valid_flit,xp=?,port=?,vc=?,dir=?/ [Kernel PMU event] <...> / # perf stat -C 0 -e ccn/cycles/,ccn/xp_valid_flit,xp=1,port=0,vc=1,dir=1/ \ diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting index e69274de8d0c..0500895b768f 100644 --- a/Documentation/filesystems/porting +++ b/Documentation/filesystems/porting @@ -287,8 +287,8 @@ implementing on-disk size changes. Start with a copy of the old inode_setattr and vmtruncate, and the reorder the vmtruncate + foofs_vmtruncate sequence to be in order of zeroing blocks using block_truncate_page or similar helpers, size update and on finally on-disk truncation which should not fail. -inode_change_ok now includes the size checks for ATTR_SIZE and must be called -in the beginning of ->setattr unconditionally. +setattr_prepare (which used to be inode_change_ok) now includes the size checks +for ATTR_SIZE and must be called in the beginning of ->setattr unconditionally. [mandatory] diff --git a/Documentation/sysctl/fs.txt b/Documentation/sysctl/fs.txt index 302b5ed616a6..35e17f748ca7 100644 --- a/Documentation/sysctl/fs.txt +++ b/Documentation/sysctl/fs.txt @@ -265,6 +265,13 @@ aio-nr can grow to. ============================================================== +mount-max: + +This denotes the maximum number of mounts that may exist +in a mount namespace. + +============================================================== + 2. /proc/sys/fs/binfmt_misc ---------------------------------------------------------- diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index 9fa2bf8c3f6f..7830f1c34a7d 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -1955,6 +1955,7 @@ registers, find a list below: PPC | KVM_REG_PPC_TM_VSCR | 32 PPC | KVM_REG_PPC_TM_DSCR | 64 PPC | KVM_REG_PPC_TM_TAR | 64 + PPC | KVM_REG_PPC_TM_XER | 64 | | MIPS | KVM_REG_MIPS_R0 | 64 ... diff --git a/Documentation/x86/exception-tables.txt b/Documentation/x86/exception-tables.txt index 32901aa36f0a..e396bcd8d830 100644 --- a/Documentation/x86/exception-tables.txt +++ b/Documentation/x86/exception-tables.txt @@ -290,3 +290,38 @@ Due to the way that the exception table is built and needs to be ordered, only use exceptions for code in the .text section. Any other section will cause the exception table to not be sorted correctly, and the exceptions will fail. + +Things changed when 64-bit support was added to x86 Linux. Rather than +double the size of the exception table by expanding the two entries +from 32-bits to 64 bits, a clever trick was used to store addresses +as relative offsets from the table itself. The assembly code changed +from: + .long 1b,3b +to: + .long (from) - . + .long (to) - . + +and the C-code that uses these values converts back to absolute addresses +like this: + + ex_insn_addr(const struct exception_table_entry *x) + { + return (unsigned long)&x->insn + x->insn; + } + +In v4.6 the exception table entry was expanded with a new field "handler". +This is also 32-bits wide and contains a third relative function +pointer which points to one of: + +1) int ex_handler_default(const struct exception_table_entry *fixup) + This is legacy case that just jumps to the fixup code +2) int ex_handler_fault(const struct exception_table_entry *fixup) + This case provides the fault number of the trap that occurred at + entry->insn. It is used to distinguish page faults from machine + check. +3) int ex_handler_ext(const struct exception_table_entry *fixup) + This case is used for uaccess_err ... we need to set a flag + in the task structure. Before the handler functions existed this + case was handled by adding a large offset to the fixup to tag + it as special. +More functions can easily be added. |